Micrometer-calipers.



F. O. JAQUES, SR.

MICROMETER GALIPERS.

APPLICATION FILED PEB.2,1914.

1,121,632, Patented Dec.22 ,1914.

Fig--1 Z Y 1 1 353Z'33 8 ETTCZENZY I UNITED sT sPATEN OFFICE.

- rERNANDo'oscAE'JAQUEs, SR, OFCBANSTON, nnonn ISLAND.

IoRoMEr Rc LIrERs;

To all whom it may concern e Be it known that I, FERNANDO' OSCAR JAinis, Sn, a citizen ofthe 'United States,

residing at Cranston, in the county of Providence and State of RhodeIsland, haye invented 'a new and useful ImprovementinMicrometer-Calipers, of which the following is a specification.

My invention has reference to an inr provementinmicrometer calipers andmore I from between the sight opening members.

In the drawings, 10 indicates the U- particularly to an improvement inthe inicrometer caliper patented to mefAp'ril 25,

In easy reading micrometer calipers having openings through which theindicating numerals areread, dust, d1rt,"ete,, 1s liable to enterthrough these openings and clog up the interior mechanism ofthe'caliper.

The object of my invention'is to improve the construction of the saidmicrometer caliper, whereby the member which pivotally supports thedisks is secured 'to and, forms an inner detachable part'fof the for-"ward end of'thethimble, the. external part of which is now composed oftwo members. i or thin shells, one within the other"; each shell havingcoinciding" sight openings through which the numerals on, the disks areread; said openings being. now closed by. a thin transparent member,such as a thin sheetl'of mica heldbetweenthe two shells, therebyprotecting the inner-mocha? ni'sm of the instrument .againstthe entranceof dustjdirt or oil, throughthe sight openings in the thimble. Y

My invention consists in the peculiar; and

novel construction of means for detachably' securing the disk holdingmember to the thimble and means for closing the-sight openings by theuseof a thin sheetof transparent material, such, as mica, held betweentwo'members or shells forming the forward end of the thimble,;and otherdetails of construction in said easy reading-micrometer caliper, as willbe more fullyset forth hereinafter and claimed.

Figure 1. is 'a face View ofmy improved micrometer, caliper showing thesame reading to three hundred and twenty-five one thousandths of aninch. Fig. 2. is an enlarged transverse sectional view taken on line 2.2. of Fig. 1. Fig. 3. is an enlarged longitudinal. detail sectional viewtaken on line 3. 3. of Fig[ 1. Fig. 4. is an enlarged end view of thedisk holding member. Fig. 5. is an enlarged side View of the disk hold-5 ing member. Fig: 6. is an 'enlarged side view of the disk operatingmember, looking larged si'de view-of thesight openingmem- 'bers removedfrom the forward end of the thimble, the inner sight opening member Ibeing anexact duplicate of the outer except as to size, and Fig. 8.is anenlargedface view of one of'the tllll'l mica plates'r'emoved shapedframe of the caliper having an outwardly extending internallyscrew-threaded barrel 11, which has an outer longitudinal groove 12 andis graduated on its'surface by "transverse lines into tenths of an inch,with an indicating numeralifor each line, as shown in Fig. 1. Aring 13.surrounds the barrel 11. onwhich. it has a sliding fit and it isconstructed to have a fiat edge 14. an

Specificationbf Letters -Patent. d Patented D 22, 1914L Applicationfiled February 2 1914- SeriaIYNo. 815,991." V

outwardly projecting tooth 15, with indenturesl16; 16. at each side ofthe tooth and an outwardly extending spline 17 which has a sliding fitinthe groove12 in the bar j rel 11. A thimble18 forms a art of an eX-.ternally screw-threaded spin le 19 which extends'through [and is inscrew-threaded engagement withthe barrel 11, as shown in Fig. 3. Thethimble 18 surrounds the barrel 11 and has 'the reduced externallyscrewthreaded forward end, 20. l A disk holdingmember 21, Figs. 4 and 5,

vis constructed to 'have a slidingfit'on the barrel 11, series of fiveflattened outer faces 22. each of said faces 22. 22. having a circulardepression 28, a central stud 24 .inleach depressionforminga pivot foran I 1nd1cat1ng disk 25. A series of five indicating disks 25.25. areeach constructed to have "four equally disposed shaped notches 26.

2 6.'in their periphery, the edges of each notch extending outward jintorounded projections27. 27 and a central pivot hole 28 for a stud 24,"andeach disk is rotatably secured in a depression 23 on a stud 24 ofthe'member 21 one for each depression, at right angles. to the aXis ofthe thimble, as shown in Figs. 2 and 3. disks 25. 25. each have fournumerals on their outer faces and are positioned on the member 21 fromleft to right, number 1 disk isnumbered 0. 25. 50. 75, number 2 disk 5.

'30. 55. 80. as shown in Fig. 6., number 3 disk 10. 35. 60. 85., number4 disk 15. 40. 6 5. 90. and number 5 disk 20. 45. 70. 95;

The indicating each number; indicating: thousandthszof." an

inch by fifths. Number 1. 3.1 4. and; 5

disks are not. shown. The. bottom: of] each of the depressions 23. 23.in the disk hold ing member 21v is. cut. away. forming; openings 29. 29.for'the' tooth on the ring-13 to extend through and. engage with the andshape with the thimble 1.8., it is internally screw-threaded and issecured to the forwardend ofthe thimble by screwingthe same-over thescrew-threaded forward end. 20.. of the thimble, asshown in. Fig; 3. The

' disk holding member 21 is locked to; the

thimble 18 by a screw screwed into the' thimble at the intersection ofthedisk holding member and the thimble. An inner five sided shell 31'surrounds'and fits overthe live sided portion of the disk holdingmember'21 each side havinga sightopening 32 through which the numeralson the disks are read, a

corresponding outer shell 33 surrounds and fitsover the inner shell 31and has coinciding sight openings 32. 32. ineach side, the

' sight openings 32. in the'inner shell'being closed by a thintransparent plate 34.

preferably of mica, which is securely and" inner and outer shells, onefor each side.

Theforwar'd end of both shells are tapered, the outertapereden'd 3.5 ofthe outer shell of an inchj The shells 31 and 33 are heldin I place byfriction. When assembled, the disk holding member 21 forms a" part oftheI Y tion on the barrel 11. by the spline 17in the thinible 18,'the ring13 is held in place in the disk holding member by the forward end of thethimble; it has a 'longitudinalf movement with the thimble 18- and diskholding member 21, but is heldffrom rotagroove 12. in the barrel'll, asshown in Fig.

3. The indicating disks 25. 25. are held.in

their operative positions by the inner shell 31. and the thintransparentplate 3 4: of mica covering the sight openings 32. 32.eliminates the entrance of dust or dirt to the inner mechanism ofthecaliper.

Inthe operation of'my improved micromp I openings all for'the'purpo'seas described.

eter caliper the indicating disks 25.25. revolve with the disk holdingmember 21 and the thimble around the axis of the spindle 19, but areprevented from revolving on their own axis or studs 24. 24:. bytherounded projections 27. 27. on, the periphery of the disks engaging withthe fiat-edge '14 of the ring 13 until the tooth 15 on the ring i l. Amicrometer calig from left to right on the disk holding mem-.

ber 21 .with the '0 showing through a sight;

opening 32 which is one. linerwith' the m1 merals on the barrel. 11.,the reading; always beingtaken through an opening in this posi- 7 tion.One fifthof a revolution of the thirn ble 18 to the leftbrings the tooth15 011 the Y ring 13 into a-notch 26in the indicating disk N 012. asshownl in Fig. 6 and rotates the disk one quarter o'fa revolution andbrings the numeral 5 1011 the disk under a sight openingF'32. Thereadingwould nowbe five one thousandthsof an inch. The next fifthturnwouldrevolv'edisk No. 3; each fifth of- I a revolution of thethirnble operating' a disk and bringing up the correct number on aline'with the numerals on the barrel. After thirteen'complete turns.thereading would be three hundred and twenty fiveone thousandths of aninch, assh'own in Fig.1. The operation is I the same whether the,thimble is turned to'the left'or right, the numerals "the thimble18'has been r'evoli' ed to the left on the disks ialway's showing] thecorrect a reading in either direction.

Having thus described Y my claim, as new I invention I rel, a thirnblerotata ly surrounding the barrel, a diskholding member on the inner endof and forming'an operativepart of the? disk holding member, means 'on'.the disk er comprising a bar- Y thimble, a series of indicatingfdisks"on the the disks? intheir/operative positions. ex-.

ternal means on thefldisk holding member adapted to hold thedisksinplace; means for fastening-the disk holding member directly to the innerend of the thimble and means.

, for operating the indicatingdisks.

2. A thimble for micrometer calipershav inga detachable inner endportion formed disk holding portion of the" thimble and having sightopenings, a secondshell over [into a disk, holdingmemberya shell overthe intermediate the shells'and' closing the sight I In testimonywhereo'fylf ha e signed-my the fcon'i'niis'sioner of Patents?

